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    CVE-2026-59950

    The MCP Python SDK, called mcp on PyPI, is a Python implementation of the Model Context Protocol (MCP). Prior to 1.28.1, the deprecated mcp.server.websocket.websocket_server transport accepted WebSocket handshakes without applying Host or Origin header validation, leaving no SDK-level way to restrict which origins could connect to applications that exposed that transport. This issue is fixed in version 1.28.1.

    Published:Jul 15, 2026
    Last Modified:Jul 17, 2026
    EPS:Jul 15, 2026
    EPSS Score:0.00181
    CVSS Score:7.6

    Affected Products

    Vendor
    Modelcontextprotocol
    Product
    Python-sdk

    Exploits

    No exploit reference

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High